audit: type=1400 audit(2000000370.979:103676): avc:  denied  { map } for  pid=356 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470
Read of size 8 at addr ffff8881dbb07920 by task syz-executor.3/353

CPU: 1 PID: 353 Comm: syz-executor.3 Not tainted 4.14.157-syzkaller #0
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xe5/0x154 lib/dump_stack.c:58
 print_address_description+0x60/0x226 mm/kasan/report.c:187
 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316
 unwind_next_frame+0x169f/0x1810 arch/x86/kernel/unwind_orc.c:470
 perf_callchain_kernel+0x3a0/0x540 arch/x86/events/core.c:2338
 get_perf_callchain+0x2f5/0x770 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0x6a8/0x1360 kernel/events/core.c:6149
 __perf_event_output kernel/events/core.c:6265 [inline]
 perf_event_output_forward+0xdc/0x220 kernel/events/core.c:6283
 __perf_event_overflow+0x12d/0x340 kernel/events/core.c:7541
 perf_swevent_overflow+0x7a/0xf0 kernel/events/core.c:7617
 perf_swevent_event+0x112/0x270 kernel/events/core.c:7655
 perf_tp_event+0x633/0x7f0 kernel/events/core.c:8079
 perf_trace_run_bpf_submit kernel/events/core.c:8049 [inline]
 perf_trace_run_bpf_submit+0x113/0x170 kernel/events/core.c:8035
 perf_trace_lock_acquire+0x341/0x4e0 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x279/0x360 kernel/locking/lockdep.c:3993
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:160
 test_clear_page_writeback+0x146/0x930 mm/page-writeback.c:2726
 end_page_writeback+0xb4/0x160 mm/filemap.c:1166
 end_buffer_async_write+0x29b/0x440 fs/buffer.c:377
 end_bio_bh_io_sync+0xc2/0x100 fs/buffer.c:3038
 bio_endio+0x334/0x630 block/bio.c:1921
 req_bio_endio block/blk-core.c:205 [inline]
 blk_update_request+0x2d5/0xa20 block/blk-core.c:2784
 scsi_end_request+0x7d/0x9d0 drivers/scsi/scsi_lib.c:659
 scsi_io_completion+0x9aa/0x1440 drivers/scsi/scsi_lib.c:885
 scsi_softirq_done+0x2a5/0x370 drivers/scsi/scsi_lib.c:1671
 __blk_mq_complete_request+0x307/0x6e0 block/blk-mq.c:571
 blk_mq_complete_request+0x24/0x30 block/blk-mq.c:591
 virtscsi_vq_done+0xb9/0x150 drivers/scsi/virtio_scsi.c:223
 vring_interrupt+0x104/0x150 drivers/virtio/virtio_ring.c:951
 __handle_irq_event_percpu+0xff/0x7a0 kernel/irq/handle.c:147
 handle_irq_event_percpu+0x76/0x150 kernel/irq/handle.c:187
 handle_irq_event+0xa2/0x12d kernel/irq/handle.c:204
 handle_edge_irq+0x21b/0x820 kernel/irq/chip.c:770
 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
 handle_irq+0x225/0x2e2 arch/x86/kernel/irq_64.c:87
 do_IRQ+0x7f/0x1c0 arch/x86/kernel/irq.c:230
 common_interrupt+0x8c/0x8c arch/x86/entry/entry_64.S:576
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:mod_delayed_work_on+0x116/0x130 kernel/workqueue.c:1620
RSP: 0018:ffff88819df6fc90 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff8e
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 1ffff11034e986ef
RDX: 0000000000000000 RSI: ffff8881a74c3758 RDI: 0000000000000216
RBP: 1ffff11033bedf92 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000216
R13: 0000000000000040 R14: ffff8881da100500 R15: 0000000000000000
 mod_delayed_work include/linux/workqueue.h:521 [inline]
 wb_queue_work+0x1f4/0x470 fs/fs-writeback.c:199
 bdi_split_work_to_wbs fs/fs-writeback.c:978 [inline]
 sync_inodes_sb+0x1a1/0x920 fs/fs-writeback.c:2460
 __sync_filesystem fs/sync.c:34 [inline]
 sync_filesystem fs/sync.c:67 [inline]
 sync_filesystem+0x13e/0x240 fs/sync.c:48
 SYSC_syncfs fs/sync.c:166 [inline]
 SyS_syncfs+0x89/0xe0 fs/sync.c:155
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a679
RSP: 002b:00007fc097a6cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000132
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc097a6d6d4
R13: 00000000004ca644 R14: 00000000004e36d0 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea00076ec1c0 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000001000(reserved)
raw: 4000000000001000 0000000000000000 0000000000000000 00000001ffffffff
raw: ffffea00076ec1e0 ffffea00076ec1e0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881dbb07800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881dbb07880: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1
>ffff8881dbb07900: f1 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00
                               ^
 ffff8881dbb07980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881dbb07a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================